Possibly the poster referring to tunings for steel guitar (pedal and/or non-pedal).
Lots of variables there. number of strings and layout of the chords/accidentals etc.

For example. a C6 "Junior Brown" differs from a classic C6 (assuming 8 string neck =. ACEGACEG) in that the low A is usually raised to a Bb to give you a C7 if you want it.
Its been a few years since I messed on those things. A very humbling experience playing a pedal steel guitar.


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